[Neuronal Plasticity-related Mechanisms Triggered by the Transcriptional Coactivator MRTFB, a Regulator for Neuronal Morphology and Gene Expression].

This review looks at a protein called MRTFB that helps connect changes in brain cell shape with gene activity, which is important for learning and memory. The researchers focus on how a brain growth factor (BDNF) activates pathways that affect how neurons grow and which genes are turned on. They briefly mention this might be relevant to autism and intellectual disability, but don't provide specific details about these connections.

This review examines MRTFB, a protein that links changes in brain cell structure to gene expression, which may be important for learning and memory. The authors focus on how brain-derived neurotrophic factor (BDNF) activates MRTF/SRF signaling pathways that influence neuronal shape and gene activity. MRTF proteins contain actin-binding regions and work with serum response factor (SRF) to regulate gene expression. When Rho signaling releases MRTF from actin, it moves to the cell nucleus and increases SRF-dependent gene expression.

The review discusses BDNF's role in neuronal survival, gene expression, and dendritic growth through MRTF activation. The authors briefly mention potential connections to neurodevelopmental disorders including autism spectrum disorder and intellectual disability, though specific mechanisms are not detailed.

The MRTF/SRF pathway may represent a novel target for understanding and potentially treating neurodevelopmental conditions. However, the connection to autism remains speculative and requires further research to establish clinical relevance and therapeutic potential.

This is a review article rather than original research, so findings represent synthesis of existing literature rather than new data. The connection to autism spectrum disorder and intellectual disability is only briefly mentioned without detailed mechanistic explanation or clinical evidence.

Synaptic plasticity is a key mechanism underlying long-term memory and learning, with proposed associations with altered actin cytoskeleton and gene expression in neurons. Myocardin-related transcription factor (MRTF) family members, abundantly expressed in the brain, have actin-binding motifs at the N-terminus and act as cofactors of serum response factor (SRF). Rho signaling may promote MRTF's release from G-actin and subsequent translocation into the nucleus, and increases SRF-dependent gene expression. MRTF is therefore thought to act as a link between morphological change and gene expression in neurons.

In this review, we focus on the neurotrophin, brain-derived neurotrophic factor (BDNF). BDNF plays crucial roles in neuronal survival, gene expression, and dendritic growth, which are essential for neuronal plasticity. As previous studies suggest that BDNF triggers the activation of MRTF/SRF-mediated signal transduction, we have studied how this supposed regulatory ligand is involved in the functional MRTF changes in neurons. We review the BDNF-mediated roles of MRTF in neuronal morphology and gene expression and briefly discuss the possible involvement of MRTF in neurodevelopmental disorders, such as autism spectrum disorder and intellectual disability.